Hi I'm a 20 year old female and have been feeling dizziness and lightheaded for about a week now,it's very scary and have been to the doc, he has checked on my heart, blood and all has been fine, it's been getting worst as the days go by and happening more often. Doc also said its most likely my mind playing tricks on me as I've be constarly worried about it. Have not be able to shake this off.. Need help any ideas ?